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International Taxation12 Min Read

Five Countries, One Treaty Table: What Cross-Border Tax Advisory Actually Looks Like

The costliest cross-border tax mistakes happen where two countries’ rules and the DTAA between them interact, not inside any single tax code. Drawing on advisory across India, the UAE, the US, the UK and Singapore, CA Mithilesh Reddy explains why substance comes before tax rates. He also covers the India–UAE corridor and gives a five-point seam checklist.

CA Mithilesh Sai Sannareddy
CA Mithilesh Sai SannareddyChartered Accountant & Tax Expert
Five Countries, One Treaty Table: What Cross-Border Tax Advisory Actually Looks Like

Last reviewed: October 2026

Quick answer. Where do cross-border tax mistakes happen? Rarely inside one country’s tax code. They happen at the seams, where two countries’ rules and the Double Taxation Avoidance Agreement (DTAA) between them interact in ways neither side anticipated. Before discussing tax rates, test substance first: where decisions are actually made and where people actually work. Residency, permanent establishment risk and treaty eligibility all turn on facts.

A few years ago I was on a call at 6:30 in the evening, Hyderabad time, the start of the working day in New York, early afternoon in London, and late afternoon in Dubai. Four people, four time zones, one client, an Indian-founded group with operations touching all of them, trying to figure out where a single cross-border royalty payment should actually be taxed, and under which treaty article. Nobody on that call was confused about the tax law in their own jurisdiction. Everybody was slightly unsure the moment the conversation crossed a border. And somewhere behind all four of us was a founder who would have to live with whatever we decided.

What is a DTAA and why does it matter for cross-border structuring?

A Double Taxation Avoidance Agreement (DTAA) is a bilateral treaty that allocates taxing rights over cross-border income, caps the rate the source country can charge on items such as dividends, interest and royalties, and requires the residence country to give relief so the same income is not taxed twice. In India, a person entitled to treaty benefits can apply the treaty or domestic law, whichever is more beneficial, subject to GAAR and any principal purpose test. A non-resident also needs a Tax Residency Certificate from its home country to claim relief. India’s treaty network is listed in the Tax Treaties section of the Income Tax Department’s International Taxation pages.

Where do cross-border tax mistakes actually happen?

Here is something that surprised me early in my international tax career and still holds true after years of advising across India, the UAE, the US, the UK and Singapore: the costliest structuring mistakes almost never happen because someone got a single country’s law wrong. They happen at the seams, the point where two countries’ rules, and the DTAA sitting between them, interact in a way neither side fully anticipated. A withholding tax rate that looks correct in isolation. A permanent establishment risk that only becomes visible once you map an employee’s actual travel pattern across two jurisdictions. A holding structure that made perfect sense under one country’s rules and creates an unintended tax residency question under another’s.

_The costliest cross-border mistakes rarely happen inside one country’s tax code. They happen in the seam between two countries’ rules, the place a single-jurisdiction advisor simply isn’t positioned to see._

Why did the India–UAE corridor change the job?

When we set up SBC Tax Consulting LLC in Dubai in 2023, it wasn’t a symbolic expansion. It came directly out of watching Indian founders and MNEs move real operations into the Gulf and immediately run into questions nobody on their existing advisory team could answer with confidence. The UAE’s corporate tax framework is still relatively young (it applies to financial years starting on or after 1 June 2023, as set out by the UAE Federal Tax Authority and the UAE Ministry of Finance), and its interaction with India’s DTAA provisions is exactly the kind of seam I mean: technically documented, but under-tested in practice compared to corridors like India–US or India–UK, where both countries have taxed corporate profits for decades.

That is also where much of our UAE and wider Gulf advisory work lives: helping a company set up correctly in the region the first time, rather than untangling a structure two years later once a tax authority on one side of the corridor has asked an uncomfortable question. The same instinct runs through our GCC incubation work for multinationals building Global Capability Centres in India: get the structure right before the first hire. See how the Gulf practice has grown through SBC Tax Consulting LLC, alongside our India base at SBC LLP. Indian founders should also check that an outbound structure fits the RBI’s Overseas Investment Master Direction under FEMA.

What question should you ask before any cross-border structure?

Founders and CFOs often want to talk about tax rates first. I usually redirect, at least initially, to a much less exciting question: where does actual decision-making happen, and where do people actually sit and work? Tax residency, permanent establishment risk and treaty benefit eligibility are, at their core, questions about substance and fact pattern. You cannot structure around them with a cleverly worded agreement if the underlying facts don’t support it.

Seam checkThe question to askWhy it matters
Tax residencyWhere are key decisions actually taken and by whom?A UAE company effectively managed from India risks being treated as Indian-resident under the place-of-effective-management (POEM) test.
Permanent establishmentWhere do employees really work and travel, and who concludes contracts?Regular activity or decision-making in a country can create a taxable presence without a registered entity.
Treaty eligibilityDo we hold a Tax Residency Certificate and meet GAAR / principal purpose tests?Treaty benefit is not automatic; it must be claimed and supported.
Income characterisationIs the payment a royalty, fee for technical services or business profit under the treaty?The treaty article, and therefore the withholding rate, depends on the characterisation.
Outbound complianceDoes the structure fit FEMA’s Overseas Investment Rules?A tax-efficient structure still has to be regulatorily compliant on the Indian side.

_Orientation checklist, not advice. Apply it to your own facts with a qualified adviser._

I’ve watched more than one otherwise well-intentioned outbound structure fail this test quietly, years after it was set up, because nobody asked that question honestly at the start. It is rarely dramatic. It’s usually a slow, expensive realisation during a routine audit. The hardest part usually isn’t the tax bill. It’s watching a founder realise that a decision they trusted was never as safe as it looked.

What does a five-treaty client conversation actually sound like?

Back to that evening call. What eventually resolved it wasn’t a single brilliant technical insight. It was patiently mapping the actual commercial substance behind the royalty arrangement against each relevant treaty article, one jurisdiction at a time, and being honest with the client that two of the four structuring options we had discussed earlier that week simply wouldn’t survive scrutiny once we did that mapping properly. Clients don’t always want to hear that a shortcut isn’t available. Saying so clearly, early, is worth far more to a long-term relationship than a structure that looks clean on a slide and doesn’t hold up in practice.

That instinct, mapping the DTAA position across every jurisdiction genuinely engaged rather than treating each country as a silo, is why the OECD and UN Model Tax Conventions and the OECD BEPS framework have become common reference points in our advisory work, even outside formal Pillar Two engagements. They’re often the closest thing to a shared vocabulary between very different domestic tax systems, though never a substitute for the treaty text itself and each country’s own rules.

What would I tell a founder before their first cross-border structure?

Get the substance question honest before you get the tax rate question clever. Map every treaty genuinely in play, not just the one your headquarters happens to sit in. And make sure whoever advises you can see both sides of the corridor you’re operating across, because the seam is exactly where a single-jurisdiction view runs out, and where the expensive mistakes tend to live. The honest version is the only one you can still explain when a tax officer asks, years later.

Key takeaways

  • The costliest cross-border tax mistakes typically occur at the interaction between two countries’ rules, the treaty “seam”, rather than within one country’s tax code.
  • The India–UAE corridor is an under-tested seam because UAE corporate tax is recent (financial years starting on or after 1 June 2023).
  • Tax residency and permanent establishment are fact-pattern questions about substance. A clever agreement cannot override them.
  • Confident multi-treaty advice (India, UAE, US, UK, Singapore) means mapping each jurisdiction’s actual treaty position, not applying one template.
  • Seam-level risks are easiest to catch when advice covers both sides of a corridor.

Frequently asked questions

What is a Double Taxation Avoidance Agreement (DTAA) and why does it matter for cross-border structuring?

A DTAA is a bilateral treaty that allocates taxing rights over cross-border income, caps source-country rates on dividends, interest and royalties, and requires the residence country to give relief so income is not taxed twice. In India, a taxpayer can apply the treaty or domestic law, whichever is more beneficial, subject to GAAR and any principal purpose test, and a non-resident needs a Tax Residency Certificate with the prescribed self-declaration to claim relief. Getting the applicable treaty article right is central to correct cross-border structuring.

What tax issues should Indian companies expect when expanding into the UAE?

Key considerations are UAE corporate tax residency and permanent establishment risk, how the India–UAE DTAA interacts with the UAE’s relatively new corporate tax framework, and structuring UAE and wider Gulf entities so that business substance matches the intended tax position. On the Indian side, the structure must fit FEMA’s Overseas Investment Rules, and a UAE company effectively managed from India risks being treated as Indian-resident under the place-of-effective-management (POEM) test.

What is permanent establishment risk in international tax?

It is the risk that a company’s activities in a foreign country, such as employees regularly working there or decisions effectively made there, create a taxable presence in that country even without a registered local entity. It is one of the first things to test in any cross-border operating structure.

Why does tax advice need to cover both sides of a corridor?

Because most expensive mistakes sit in the interaction between two countries’ rules, which a single-jurisdiction adviser is not positioned to see. Advice that maps the treaty position in every jurisdiction involved catches these seams before a tax authority does.

About the author and recognition

CA Mithilesh Reddy (Mithilesh Sai Sannareddy) is a Chartered Accountant (FCA, ICAI) with an LLB, and Founder & CEO of Steadfast Business Consulting LLP (SBC). He advises multinational groups, venture-backed companies and founders on transfer pricing, international taxation, tax litigation and cross-border structuring from India and the UAE. Read his full profile.

Continue the conversation

This piece continues our series on building an independent international tax and transfer pricing advisory. Read next: what 50+ tribunal appeals taught me about tax litigation, why I bet on technology instead of just hiring more CAs, or the year I said yes to ICAI. Explore SBC’s international taxation practice by sector, our ventures including TP Doc Gen AI, or start a conversation about a cross-border structure or GCC incubation in India.

Sources and further reading

_Editorial note: This article reflects general professional perspective and personal reflection. It is provided for informational purposes only and does not constitute tax, legal, or financial advice for any specific matter. Please consult a qualified professional about your own facts and circumstances. Any client or matter scenarios described are illustrative composites, with identifying details changed or generalised to protect confidentiality; they do not describe a specific, identifiable client, case, or engagement._

Topics:#Transfer Pricing#Corporate Tax#DTAA advisory India#cross-border tax structuring#India UAE tax treaty#outbound investment structuring#GCC incubation#permanent establishment risk#tax residency certificate
CA Mithilesh Sai Sannareddy
ABOUT THE AUTHOR

CA Mithilesh Sai Sannareddy

Chartered Accountant, Supreme Court Advocate & Founder of Steadfast Business Consulting (SBC). Specializing in International Tax, Transfer Pricing Litigation, and GCC Expansion Advisory across India, UAE & US.